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Data sheet en_us_1886736267

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Communications Systems | LBB 1920/00 Plena Universal Pre-AmplifierLBB 1920/00 Plena Universal Pre-Amplifier ▶ Four universal low-noise input channels for microphone or line ▶ Separate tone control, speech filter and direct output per channel ▶ Selectable blocking, serial and mixing priorities ▶ Multifunctional inter-connection point ▶ Priority and emergency relay outputs ▶ Master volume controlThe Plena Pre-Amplifier is a versatile, high-performance Balanced XLR interconnection input and output areunit with four mono-input channels. It fulfills a wide provided in combination with an insertion/cascadevariety of public address requirements at a surprisingly selector. In insertion mode an external sound processinglow cost. device, e.g. an equalizer, can be connected between these connections. In the cascade mode, multiple LBB1920/00 pre-amplifiers can be cascaded to increase the number ofFunctions input channels to 8, 12, or even more. Internally the interconnection input can be switched as an emergencyAll input channels provide the choice of a balanced 3‑pin input with a signal level detector (VOX). If an emergencyXLR-connector for microphone or line level (selectable), a audio signal is detected, this channel overrides all others.balanced 5‑pin DIN-connector for microphone or line level The emergency input channel has its own volume presetwith priority contact, or a line level stereo cinch- and bypasses the master volume control.connector, converted to mono. Microphone inputs have aphantom power supply. Each input channel has its own For the emergency input another VOX activated relay isvolume and tone control, a selectable speech filter to provided to trigger external equipment or for local volumereduce the bass content of the speech signal for improved control override. An overload protected 24 VDC outputintelligibility, and a balanced, direct output on XLR, that provides power for driving external relays, making anbypasses the channel controls. external power supply unnecessary.Three priority modes are available for the input channels. An additional microphone level output is available on theIn blocking mode the input channel that is activated first DIN connector, parallel to the balanced XLR mastergets priority over all other input channels. In serial mode output. This provides an input signal for a mixing desk orinput channel 1 has priority over channels 2, 3 and 4; a microphone input channel for a mixer amplifier, such aschannel 2 has priority over channels 3 and 4; and channel the Plena LBB 19xx/10. A tape output is also available.3 has priority over channel 4. Each of the input channels The master output channel, or one of the input channels,can be mixed to the master output, irrespective of can be selected to be monitored with headphonepriority, by separately setting that channel to the mixing connector and LED meter.mode. www.boschsecurity.com